Lesson: Chapter 10 — Power and energy in electrical appliances

10.2. Electrical energy used by appliances 2 of 4 Reset answers

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Question 2

A 50 W lamp is on for 1.5 hours. How much energy does it use?

A 75 J B 4500 J C 270 000 J D 27 000 J

The right answer is the one marked above.

270 000 J. E = 50 × 1.5 × 3600. Leaving the time in hours gives 75.

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